16
DC Discussions – We agreed that … LIGO-G V8 16 I/O Extenders will be powered separately from Electronics Chasses. This will permit the electronics to be turned off and on without interference to the I/O Extenders. 3-conductor extension cables will be used between the DC Power Racks and the Electronics Racks. This will provide one return per set (+/-) of supplies. All DC Power Supply returns will be tied together (bonded) at the DC Power Rack to avoid ground loops. DC Power Racks will all be tied to technical ground. Shielding DC extension cables (from DC Power Racks to Electronics Racks) is not necessary. Non-standard (18/24) voltages should be a multi-conductor cable solution similar to this solution. See DC jacket colors for voltage conventions. Remote sensing will not be used. The length of cable is too great for effective control.

17
DC Wiring Color Convention LIGO-G V8 17 Either single conductor wiring or multi-conductor cabling may be called for. These charts show the DC color code for either the single conductor wiring or the multi-conductor cabling.

21
LIGO-G V8 21 Custom 24VDC Adapter P P +/- 24VDC 10A +/- 24VDC 10A (Used between Old eLIGO 24VDC Connector and New Standard) New 24VDC Standard Old eLIGO 24VDC Standard This adapter is basically a 4” M-M cable that is intended to be attached to a chassis that does not conform to the new connector standard for 24VDC.

22
LIGO-G V8 22 Custom Socket Pigtail Cables Used between DC Power Supplies and Custom Extension Cables +/- 12VDC 10A This is a sample custom socket pigtail for use on a +/-12VDC set of power supplies. It really is a dark green cable jacket.

23
LIGO-G V VDC Adapter – IO Chassis to Power Strip New 24VDC Power Supply 24VDC Spades to Plug Adapter Adapter construction This adapter is basically a 3.5” +/- 24VDC 10A Plug Pigtail that is intended to be attached to the 24VDC input screws of IO Chasses. It will connect to a +/-24VDC Extension Cord.